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Record 1 of 10039
An optical region elemental abundance analysis of the chemically peculiar HgMn star chi Lupi
External Online Source: doi:10.1086/174733
Author and Affiliation:
Wahlgren, Glenn M.(NASA Goddard Space Flight Center, Greenbelt, MD, United States)
Adelman, Saul J.(The Citadel, Charleston, SC, United States)
Robinson, Richard D.(NASA Goddard Space Flight Center, Greenbelt, MD, United States)
Abstract: The optical spectrum of the chemically peculiar HgMn type binary star chi Lupi has been analyzed to determine atmospheric parameters and elemental abundances. Echelle spectra were obtained with the 3.9 m Anglo-Australian telescope to exploit the extreme shape-lined nature of the spectrum. This study was undertaken in support of ultraviolet analyses currently underway that utilize echell spectra obtained with the Hubble Space Telescope. For the B9.5 V primary star we obtain T(sub eff) = 10650 K, log g = 3.9, and xi = 0 km/s, while for the A2 V secondary, T(sub eff) = 9200 K, log g = 4.0, and xi = 2 km/s. Most of the elemental abundances are typical of HgMn stars with similar T(sub eff) showing an overall iron-peak elemental abundance distribution that is basically solar in nature with enhancement of the light elements Si, P, and S, as well as all detected elements heavier than the iron group. Abundances for several elements have been determined for the first time in this star, including several of the rare-earths. The secondary star spectrum shows Am star characteristics. We also discuss the relative merits of the equivalent width and synthetic spectrum techniques in determining the elemental abundences, concluding that the synthetic spectrum technique is necessary for obtaining abundances with the utmost accuracy.
Publication Date: Oct 10, 1994
Document ID:
19950050319
(Acquired Dec 28, 1995)
Accession Number: 95A81918
Subject Category: ASTROPHYSICS
Document Type: Journal Article
Publication Information: Astrophysical Journal, Part 1 (ISSN 0004-637X); 434; 1; p. 349-362
Publisher Information: United States
Contract/Grant/Task Num: NAS5-30523; NAG5-921; NAG5-1551
Financial Sponsor: NASA; United States
Organization Source: NASA Goddard Space Flight Center; Greenbelt, MD, United States
Description: 14p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: ABUNDANCE; BINARY STARS; PECULIAR STARS; STELLAR ATMOSPHERES; VISIBLE SPECTRUM; A STARS; B STARS; ECHELLE GRATINGS; MANGANESE; MERCURY (METAL); STELLAR SPECTRA
Imprint And Other Notes: Astrophysical Journal, Part 1 vol. 434, no. 1 p. 349-362 October 10, 1994
Availability Source: Other Sources
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